8.8 oz/ly (CA), 5.3 oz/sq yd (US), 179 gsm (EU). 100% Dri-FIT polyester with moisture management technology. Rib knit collar. 3-button placket. Breathable. Tagless. Relaxed fit. Due to the nature of polyester, special care must be taken throughout the decoration process. Please refer to product size spec PDF file for more details.